There is no man, however wise, who has not at some period of his youth said things, or lived in a way the consciousness of which is so unpleasant to him in later life that he would gladly, if he could, expunge it from his memory.
"Don't let yesterday take up too much of today."
The only limit is the one you set for yourself.
学习计量经济学的最佳方法是通过实践——处理真实的数据和真实的问题。
每次我写一本书，每次我面对那张空白页，我都确信我做不到。
Without ecological balance, there is no real economic benefit.
The best banking service is invisible but always available.
"To write about love is to write about humanity in its most vulnerable and powerful form."